/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/AbilitySystemBlueprintLibrary.h
Returns the expected end time (when we think the GE will expire) for a given GameplayEffect (note someone could remove or change it before that happens!)
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Ability|GameplayEffect") static float GetActiveGameplayEffectExpectedEndTime ( [FActiveGameplayEffectHandle](API\Plugins\GameplayAbilities\FActiveGameplayEffectHandle) ActiveHandle )